cab on my 02 2500HD needs complete rockers and cab corners, ive priced out getting them replaced and its pretty much same cost as a southern rust free cab. So my truck is a auto ac floor shift 4x4, I assume every 99-07 cab will work? any changes in 99-02 to 03-07 that i should be worried about? 2wd cab should be the same minus the floor shift? thanks.